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5~oloring Matters. 841 and will thus get rid of the charcoal dust, so injurious to the health of the workmen. The expenditure of water or steam may be estimated by considering the surface of the caoutchouc as the surface of a piston, and its depression joined to that of the printed surface as the stroke of the piston; consequently, when the basin is one metre square, there is an expenditure of one litre of air or water for each millimetre in the depression of the surface. Water appears on thedoi:10.1016/0016-0032(59)90214-5 fatcat:u6yesa5levb2hbwhqgiortiibi